I deleted my answer because I'm not sure if that's really a solution. It was just a guess. So I will comment, instead. Do you get a "No file" error message? Could you try to enter "\includeonly{"Contents/Installing and Configuring IIS 7/Configuring Security"}" in the preamble first. Maybe "\include" would work after this.
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Jimi OkeDec 13 '10 at 4:32

@jimi, it did not and does not make sense. If it works like so, the other \include will be ignored, right?
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xportDec 13 '10 at 6:59

@xport: sorry, that really did not make any sense. You may find the answer to your question here: stackoverflow.com/questions/2444385/…;. Someone else also had this problem a while back. It probably has something to do with the version of your distribution.
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Jimi OkeDec 13 '10 at 7:07

My knowledge of the include command is not that in-depth but as far as I understand, \includeonly reprocesses the specified file already called in the document through \include. I guess its only useful when you have multiple files and only want to work with a few. \include is never ignored, though, since that's what really makes the document. Check out the solutions from the link. If nothing works, fastest thing to do would be just to rename your file without spaces and you should be fine.
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Jimi OkeDec 13 '10 at 7:16